Well-drill jar.



J. F. CRAVEN.

WELL DRILL JAR.

Hon 1 I 914. 1,1 89,24 1 Patented July 4, 1916.

UNITED STATES JAMES F. CRAVEN, OF GRAFTON, PENNSYLVANIA.

WELL-DRILL JAR.

Specification of Letters Patent.

Patented July 4, 1916.

Application filed June 10, 1914. Serial No. 844,293.

To all whom it may concern Be it known that I, JAMES F. CRAVEN, a resident of Grafton, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in lVell-Drill Jars, of which the following is a specification.

This in ention relates to well drill jars, and the method of making the same.

The object of the invention is to provide a strong, durable drill jar which is not liable to break in use, in which the links are accurately guided by each other, and which drill jar may be constructed easily andeconom1- cally by a simple method and almost wholly by machine operations.

The invention is an improvement upon that shown, described and claimed in my prior patent for well drill jar, 1 0. 1,112,77 3, I granted October 6, 1914. I

In the drawings, Figure 1 is a side elevatio of one form of drill jar completed; Fig. 2 is a cross section thereof on the line 22, Fig. 1; Fig. 3 is a diagrammatic sectional view illustrating the machine for welding and forging the anvil member of one of the drill jar links; Fig. 4. is a cross section on the line 4-i, Fig. 3; Fig. 5 is a side elevation of the anvil end of a partially formed link; Fig. 6 illustrates two of such partially formed link members assembled, and showing in dotted lines the shank or head of one thereof completely formed; Fig. 7 is a sectional view showing a modified form of drill j ar; and Fig. 8 is a similar view showing another modification.

In Figs. 1 to 6 of the drawings, the drill jar is shown with links having three relns, each of hexagonal cross section, and while this is a desirable form of such article it will be understood that this is merely illustrative, as the links may be provided with two reins, as shown in Fig. 7, or with three, four or more reins, and reins may be of any desired cross sectional shape. As shown in the drawings each link is composed of three reins, those on one link being numbered 1 and those on the other link being numbered 2, each link being provided with an anvil member 3 at one end thereof and with a shank or head at at the other end thereof, said anvil and shank being formed as hereinafter described. The head of one of the links is formed as a tang 5 for attachment to the operating rod, cable or like member and that on the other link is provided with a socket G for receiving the shank of the drilling tool, both heads being provided with wrench receiving portions 7.

The drill jar shown, described and claimed in my prior patent'referred to is made by welding filling blocks between the side faces of the end portions of a set of rein bars, forging the welded ends of said bars, assembling two such partially formed links, welding fillmg blocks between the side faces of the other end portions of the rein bars, and forging or upsetting the outer ends of the two reins to form the shanks or heads.

According to the present invention, the filling blocks just referred to are dispensed with and the anvil members or striking heads and the shanks are formed directly from the solid metal of the rein bars themselves. Referring to the drawings the drill jar shown is made from suitable lengths of rolled or drawn bars, either-standard bars of hexagonal or other suitable cross section, such as can be purchased in the open market and which are cheap and also of accurate cross section, or bars of special cross section, as will more fully hereinafter appear. These bars are cut to the proper length, which length should be equal to the length of the reins in the finished link plus a sufli cient lengthat each end, depending upon the number of rein bars, to form the anvil and shank. The three rein bars are assembled and placed in a suitable machine or apparatus for clamping them in fixed relation, such as a vise or the like, and the end portions of the rein bars are then welded together and forged or upset to form the anvil. This can be done in various ways, such for instance as by an electric welding proc ess. Preferably, however, the three bars are heated to a welding temperature and are then placed between the side dies 8 of a forging press, which is provided with a bed plate 9, which is arranged to hold the rein bars symmetrically spaced around a common center. The side dies are shaped to conform to the shape of the bars, engage the free ends of the rein and simultaneously bend them toward each other, weld their side faces together and forge or upset them to produce the anvil 3. An endwise' movable upsetting head may also be used, if desired, although this is not essential. The side dies 8 are preferably so shaped as to produce a convex surface 15 on the ends of the three rein bars, as indicated in Fig. 3. Each of head.

the rein bars is forcibly upset and expands inwardly toward the center or axis of the clamping dies 8 and forcesa part of the metal of each bar inwardly to produce the central hexagonal portion of the striking head, indicated at 12. This combined forging, upsetting and welding action produces three lines of weld indicated by the dotted lines 13 in Figs. 2 and 4, and expands each of the rein bars laterally until it abuts against and becomes welded to the metal of the other two bars. It will of course be understood that the side dies 8 and bed 9 may be so shaped and proportioned as to roduce a space between the three rein ars of slightly greater diameter than the diameter of said bars thereby producing a. proper clearance between the reins of the two links of the bar when interlocked to enable them to slide easily and without substantial friction longitudinally with reference to each other.

Two partially formed links as just de scribed are assembled in the relation shown in Fig. 6, that is, with the reins interlocked and the anvils or striking members 3 opposing or abutting each other. .The free ends of the reins of one link are then heated 1n a furnace to a welding temperature and are placed between the side dies of a second forging or upsetting press of substantially the same construction as that first described and shown in Fig. 1. The dies of this press are similar to the dies 8, but are formed of the proper shape to give the shank or head the desired configuration, that is, cylindrical or any other shape and produce the wrench hold 7, as will be readily understood. Said dies are moved nwardly to compress, upset and bend 1nwardly the end portions of the reins. This action is similar to what occurs in the formation of the anvil or striking head, the three rein bars being simultaneously upset and forced laterally toward the axis of the dies and welded together to form a solid integral shank or head. A few strokes of the end plunger of the forging press and one lateral. action of the side dies is sufiicient to completely weld the reins into a solid mass and. entirely shape the shank or After one shank or head is formed in the manner described and as shown in Fig. 6, the reins of the other link member are heated to a welding temperature and are then forged and welded to form the second shank or head in the same manner. The tang 5 and socket 6 may of course be formed by forging or by the usual turning, threading and tapping operations.

Preferably the bed block 9 of the forging press is so shaped as to produce notches or channels 10 in the inner faces of the anvil and shank, leading from the axis of the link out between each pair of the reins The reins of each link are integral with the 4 anvil and shank thereof and consequently are not liable to break, as is the case with riveted links or when the welded link is between the rein and anvil or shank. Moreover, the interlocking of the drill jar links causes the anvil or striking portion of each rein to engage the striking portions of two reins of the other link directly over the weld 13 therebetween, so that there is no tendency to produce a shearing action along the lines of weld. between the several rein bars. Again each rein bar where it is forged to form a part of the anvil lies between two of the reins of the other link, as shown in Fig. 2 and consequently cannot escape from between said reins, so that the jar will hold together even if the reins separate along,

the lines of weld. The reins are also accurately shaped and are closely and positively guided during relative longitudinal movement.

Figs. 7 and 8 show modified forms of the drill jar, in'which the rein bars are specially formed or shaped. In Fig. 7 each link 20 has two rein bars 21 connected by an anvil portion 22 formed by forging and welding the rein bars as before described. In Fig. 8 each link has three rein bars 23 which are of special cross section and are connected by a hexagonal anvil portion 24 formed from the rein bars themselves. These rein bars have convex outer surfaces 25 so that the six rein bars together form a complete circle, thus reinforcing the links with additional metal.

What I claim is:

1. A drill jar link, comprising spaced parallel rein bars of uniform cross section from end to end having their end portions upset and forced inwardly into contact with each other, the contacting faces of said bars being welded together to form the anvil and shank.

2. A drill jar link, comprising three parallel hexagonal rein bars of uniform. cross section from end to end and spaced uniformly around an axis, the end portions of said bars being upset and forced inwardly into contact with each other, the contacting faces of said bars being welded together to form the anvil and shank.

3. A drill jar, comprising two interlocked links, each link being formed of parallel rein bars of uniform cross section from end to end having their end portions upset and forced inwardly into contact with each other, the contacting faces of said bars being welded together to form the anvil and shank.

i. A drill jar, comprising two interlocked links, each link being formed of parallel rein bars of uniform cross section from end to end having their end portions upset and forced inwardly into contact with each other, the contacting faces of said bars being welded together to form the anvil, the metal of each rein bar at the anvil end of each link being expanded laterally in the space between the bars of the other link and thereby interlocking with two of the bars of the other link.

5. A drill j ar, comprising two interlocked links, each link being formed of three parallel hexagonal rein bars of uniform cross section fromend to end having their end portions upset and forced inwardly into contact with each other, the contacting faces of said bars being welded together to form the anvil. the metal of each hexagonal rein bar at the anvil end of each link being expanded laterally in the hexagonal space between the bars of the other link and thereby interlocking with two rein bars of the other link.

6. A drill jar, comprising two interlocked links, each link being formed of parallel hexagonal rein bars of uniform cross section from end to end, the metal in the interlocked end portions of the bars of each link extending inwardly into the space between the bars of the other link to form the anvil, the outer or free end portions of the bars of each link being upset and forced inwardly into contact with each other, the contacting faces of said bars being welded together to form the shank.

T. The method of making drill jar links, consisting in upsetting the end portions of a plurality of rein bars and thereby expanding or forcing the metal laterally, and welding together the upset portions of said bars to form the anvil or shank.

S. The method of making drill jar links, consisting in upsetting the end portions of a plurality of rein bars and thereby expanding or forcing the metal laterally, and welding together the upset portions of said bars to form the anvil or shank, said steps being performed simultaneously and by a single operation.

9. The method of making drill jars, consisting in upsetting the ends of a plurality of rein bars and expanding the same in wardly and laterally to fill the space between said bars, welding together the contacting faces of said upset end portions, interlocking two of said partially formed links, upsetting the free end portions of said bars and forging the metal thereof inwardly into contact with each other,and welding the contacting faces of said bars.

10. The method of making drill jars, consisting in upsetting the ends of three hexagonal rein bars uniformly spaced around an axis and expanding the same inwardly and laterally to fill the hexagonal space between said bars, welding together the contacting faces of said upset portions, interlocking two of said partially formed links, upsetting the free end portions of said bars and forcing the metal thereof inwardly into contact with each other, and welding the contacting faces of said bars.

11. The method of making drill jars, consisting in interlocking two partially formed links. each having reins of uniform cross section and length connected by an anvil lying between the bars of the other link, upsetting the free end portions of the rein bars of each link and forcing the said bars in wardly into contact with each other, and welding the contacting faces of said bars to form the. shanks.

12. The method of making drill jars, consisting in interlocking two partially formed linksaeach having three hexagonal rein bars of uniform cross section and length and connected by an anvil lying in the space between the bars of the other link, upsetting the free end portions of the bars of each link and forcing the same inwardly into contact with each other. and wel'ding'the contacting faces of said bars to form the shanks.

In testimony whereof. I have hereunto set my hand.

I JAMES F. CRAVEN. lVitnesses FRED EYLES, Z. McMIcimnL. 

